Instrument for preparing bio-ink



FIG. 1 is a perspective view of instrument for preparing bio-ink, showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a side elevation view thereof;

FIG. 5 is an opposite side elevation view thereof; and,

FIG. 6 is a top plan view thereof.

The broken lines depict portions of the instrument for preparing bio-ink that form no part of the claimed design. 

CLAIM The ornamental design for instrument for preparing bio-ink, as shown and described. 